On February 26, 1993, a truck full of explosives detonated in the garage of the World Trade Center's North Tower garage. The explosion ripped through several floors of the building and killed six people, one of them ready to go on maternity leave. A thousand people were injured. Eventually, six terrorists were convicted of the attack, which was supposed to bring the towers down. Link

ABC News spoke to some of the people who were affected by the bombing. Link

The Denver Post has a collection of photographs from the aftermath of the bombing. Link -via Metafilter